All that's well and good, but don't forget that often times a fitting "size" does not match the true opening size. eg, NPT pipe sizes are "nominal" and never is the inside diameter of NPT equal to the "size". As another example, tubing fittings often have IDs much smaller than the "size". A 3/8" tube to NPT has an ID of only 0.22" on the hose barb end.
Always be certain you know the true diameter of the fittings in use in your system.
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